display an error

[ShawshankLin]

Describe the bug

After not using it for a long time, this error occurs when it is used again. After restarting vnana, it works normally.

To Reproduce

Expected behavior
It won't show any errors.

Error logs/Screenshots
If applicable, add logs/screenshots to give more information about the issue.

Desktop (please complete the following information where):

• OS: [e.g. Ubuntu]
• Version: [e.g. 20.04]
• Python: [3.9]
• Vanna: [0.5.5]

Additional context
Add any other context about the problem here.

[AI-Mart]

After not using it for a long time, this error occurs when it is used again. After restarting vnana, it works normally. the same error

[zhiaoLee]

我碰到了同样的问题

[mingminsun]

Same issue I have met.

[mingminsun]

This because lost DB connect due to long time, you can do reconnect in your code.

[xhyyds]

your df isn't numberic,you need deal with it like:
for col in df.columns:
df[col] = pd.to_numeric(df[col], errors='ignore')
return df